Expired dapagliflozin as a promising corrosion inhibitor for copper in 1.0M nitric acid: experimental and computational validation.

Capparis Spinoza extract (CPS) was evaluated as a green corrosion inhibitor for carbon steel (CS) in 1 M hydrochloric acid (HCl) solution. Weight loss (WL) measurement, potentiodynamic polarization (PDP), and electrochemical impedance spectroscopy (EIS) techniques were employed to assess its efficacy. CPS demonstrated excellent inhibition efficiency (% IE) By increasing both concentration and temperature. % IE reached 90.6% at 25 °C, 300 ppm, but it reached 95.2% at 45 °C and at the same concentration. Adsorption isotherm analysis indicated Temkin-type behavior, suggesting both physical and chemical adsorption mechanisms, with the latter being predominant. Thermodynamic calculations (-ΔG°ads = -38.1 kJ mol− 1 at 25 °C) confirmed the spontaneous adsorption process, the stability of the formed adsorbed layer and shows that the CPS is mixed (physical and chemical) adsorbed on CS surface. PDP data classified CPS as a mixed-type inhibitor. EIS spectra exhibited characteristic inductive and capacitive loops at low and high frequencies, respectively. The formation of a protective CPS film on the CS surface was confirmed by atomic force microscopy (AFM) and Fourier transform infrared spectroscopy (FT-IR). The corrosion inhibition mechanism was elucidated through a combination of experimental and surface characterization techniques.Supplementary InformationThe online version contains supplementary material available at 10.1038/s41598-025-30968-5.

Inhibition action of seroquel on corrosion of zinc in 0.1 M HCl solution was investigated using weight loss, electrochemical potentiodynamic polarization and impedance spectroscopic techniques. Corrosion inhibition efficiency showed the positive effect with increase in concentration of inhibitor and with the increase in temperature. Results obtained from all the methods are in good agreement with each other. Inhibition effect of inhibitor is due to the adsorption of seroquel molecule on zinc surface from bulk of the solution and the process of adsorption follows Temkin’s adsorption isotherm. Potentiodynamic polarization studies revealed that seroquel acts as a mixed type of inhibitor. Corrosion inhibition mechanism is explained by activation and thermodynamic parameters. Surface morphology of the corroded metal was studied by scanning electron microscopic studies and FT-IR spectrum of the corrosion product further confirms the process of adsorption of seroquel on metal surface.

Impact of N-decyl-nicotineamide bromide on copper corrosion inhibition in acidic sulfate containing environment: Electrochemical and piezoelectrochemical insights

The Corrosion inhibition of copper in nitric acid has been studied by 8-hydroxy-7-(-4-methoxy-phenylazo) quinoline-5-sulfonic acid using weight loss and electrochemical measurements. It was found that the (HQSA) act as a good corrosion inhibitor for copper in all concentrations of the inhibitor. The inhibition action depends on the concentration of the (HQSA) in the acid solution. Results for weight loss and electrochemical measurements indicate that inhibition efficiency increases with increasing inhibitor concentration. Polarization curves revealed that this compound is mixed type inhibitor. The adsorption of (HQSA) on the surface of the copper specimens obeys Temkin adsorption isotherm. Some thermodynamic and kinetic parameters for the corrosion process were estimated, and the values support the results obtained. Some quantum chemical parameters for (HQSA) were calculated.

3-(4-chlorophenyl)-7-methyl-5H-[1,2,4]triazolo[3,4-b][1,3,4]thiadiazin-6(7H)-one (CTT) was synthesized and evaluated as corrosion inhibitor for copper in one molar HNO3. The adsorption properties for the synthesized CTT were determined by experimental and theoretical methods in acid environment. The chemical method such as mass loss method (ML), DC potentiodynamic polarization (PDP) and AC impedance (EIS) techniques were utilized to determine the inhibitive behavior of CTT. Outcome data obtained from these methods displayed that with increasing the concentration of CTT its inhibition efficiencies (%IE) increases and reached 91.5% at 24x10-6 M , 25oC using EIS technique. The presence of CTT reduces the capacity of the double layer (Cdl) and improves the charge transfer resistance (Rct) in a solution of one molar nitric acid. CTT is a mixed-type inhibitor from the data obtained from the polarization curves. The attained data indicated that CTT was physically adsorbed onto the Cu surface in accordance for the Langmuir adsorption. The surface protection examination was carried out using scanning electron microscopy (SEM), Energy Dispersive X-ray (EDX) and atomic force microscope (AFM). Also, The quantum chemical parameters of CTT were computed and discussed. The results of several methods are in agreement with each other.

The antibiotic Ciprofloxacin (CIPRO) was investigated as a new inhibitor for copper corrosion in Synthetic Acid Rain Solution (SAR) utilizing Mass Loss (ML) as a chemical method, Potentiodynamic Polarization (PDP), and Electrochemical Impedance Spectroscopy (EIS) as electrochemical techniques. In the presence of 600 ppm of the antibiotic CIPRO, the protection percentage reached 90.1% according to the EIS technique. Thermodynamic adsorption and activation characteristics were evaluated and described. The CIPRO adsorption on the Cu surface in the SAR solution was physical adsorption and complied with the Langmuir isotherm. According to PDP curves, the studied medication was served as a mixed type of inhibitor. This medication prevented corrosion by adhering to the metallic surface, which was demonstrated by Atomic Force Microscopy (AFM), Scanning Electron Microscopy-Energy Dispersive X-Ray (SEM–EDX), and Fourier-Transform Infrared Spectroscopy (FTIR). Results from the Density Functional Theory (DFT) and Monte Carlo simulations (MC) complement experimental results. The inhibition efficiencies obtained via different methods are consistent with each other.Graphical

The anticorrosion effect of thiazolyl blue (MTT) for copper in 3% NaCl at 298 K was researched by electrochemical methods, scanning electron-microscopy (SEM), and atomic force microscopy (AFM). The results reveal that MTT can protect copper efficiently, with a maximum efficiency of 95.7%. The corrosion inhibition mechanism was investigated by X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectral (FT-IR), and theoretical calculation. The results suggest that the MTT molecules are adsorbed on metal surface forming a hydrophobic protective film to prevent copper corrosion. It also indicates that the MTT and copper form covalent bonds. The molecular dynamic simulation further gives the evidence for adsorption. The adsorption isotherm studies demonstrate that a spontaneous, mixed physical and chemical adsorption occurs, which obeys Langmuir adsorption isotherm. The present research can help us better understand the corrosion inhibition process and improve it.

The inhibitory performance of two polymeric compounds, polythiophene (PT) and polypyrrole (PPy), on the corrosion behavior of mild steel (MSt) in 1.0 M H2SO4 solution was systematically investigated using potentiodynamic polarization, potentiodynamic anodic polarization, electrochemical impedance spectroscopy (EIS), and weight loss measurements. The novelty of this study lies in its integrated approach, which correlates experimental chemical and electrochemical analyses with quantum chemical calculations and Monte Carlo simulations to provide a comprehensive understanding of the inhibition mechanism. The results demonstrate that both PT and PPy act as mixed-type inhibitors, significantly reducing corrosion through adsorption onto the MSt surface in accordance with the Langmuir adsorption isotherm. The inhibition efficiency increases with increasing inhibitor concentration, while it decreases with rising temperature, suggesting that the adsorption process is predominantly physical in nature. Polarization measurements further confirm that PT and PPy behave as mixed-type inhibitors and exhibit pitting inhibition behavior, as evidenced by the positive (noble) shift in the pitting corrosion potential with increasing inhibitor concentration. Thermodynamic parameters associated with activation and adsorption processes were determined and discussed in detail. In addition, a comparative study of PT and PPy adsorption on the Fe (110) surface was conducted using quantum chemical descriptors and Monte Carlo simulations. The combined electronic structure analysis and adsorption results consistently indicate that PPy forms a more stable and protective adsorbed layer, in excellent agreement with experimental findings, thereby identifying it as the more effective polymeric inhibitor for mild steel corrosion protection.

The effects of 1,2-diaminoethane (DE), 1,6-diaminohexane (DH), 1,8-diaminooctane (DO), and hydrazine (H) on the electrochemical behavior of copper in 0.1 M H 2 SO 4 were investigated using the potentiodynamic polarization and electrochemical impedance spectroscopy methods at 298 K. A significant decrease in the corrosion rate of copper was observed in the presence of the investigated inhibitors. The potentiodynamic polarization data indicated that the inhibitors were of mixed type, but the cathodic effect was more pronounced. Electrochemical measurements showed that the inhibition efficiencies increased with increasing inhibitor concentration and followed the order DO > DH > H > DE. This reveals that the inhibitive actions of the inhibitors are mainly due to adsorption on the copper surface. Adsorption of these inhibitors follows a Flory-Huggins adsorption isotherm. The correlation between the inhibition efficiencies of inhibitors and their molecular structures has been investigated using quantum chemical parameters obtained by AM1 semiempirical method. Calculated quantum chemical parameters indicate that diamine compounds are adsorbed on copper surface by chemical mechanism.

Quinoxaline as a corrosion inhibitor for copper in nitric acid: Kinetics, statistical, and theoretical investigations

The objective of this work is to provide additional insight on the influence of (2E)‐3‐amino‐2‐phenylazo‐but‐2‐enenitrile and its derivative as corrosion inhibitors for copper in 0.5 M HNO3. Electrochemical techniques (potentiodynamic polarization, polarization resistance and impedance spectroscopy) as well as weight loss measurements have been employed to study the corrosion inhibition. The investigated compounds have shown inhibition efficiency in 0.5 M HNO3. Inhibition efficiency of these compounds has been found to vary with the concentrations of the compounds. The adsorption of these compounds on the copper surface from the acid solution has been found to obey Langmuir adsorption isotherm. The results revealed that the compounds are mixed type inhibitors. The effect of temperature on the inhibition efficiency was studied.

Mild steel corrosion in acidic environments presents a significant challenge with detrimental consequences for both industrial infrastructure and the environment. Effective corrosion control measures are crucial to prolonging the lifespan of equipment. Inhibition techniques have proven to be an efficient method for protecting mild steel from corrosion, particularly in acidic conditions. This study investigates the efficacy of 3-(1,3-oxazol-5-yl)aniline (3-OYA) as a corrosion inhibitor for mild steel in a hydrochloric acid (HCl) solution. Traditional weight-loss tests, as well as electrochemical techniques, such as potentiodynamic polarization and electrochemical impedance spectroscopy, were employed to evaluate the corrosion inhibition performance. The results reveal that 3-OYA, at a concentration of 0.05 mM, exhibits an outstanding protection efficacy of 93.5%. This remarkable performance can be attributed to the formation of a protective adsorption layer on the mild steel surface, effectively inhibiting the corrosion rate and enhancing inhibitory efficacy. The inhibition efficiency was found to increase with increasing inhibitor concentration, while it decreased with rising temperature. Langmuir adsorption isotherm analysis confirmed the high adsorption–inhibition activity of 3-OYA. The $\Delta {G}_{ads}^o$ value indicated the occurrence of both physical and chemical adsorption mechanisms on the mild steel surface. Furthermore, density functional theory (DFT) calculations were utilized to determine the quantum chemical parameters and establish a correlation between the inhibition activity and the molecular structure. The consistency between the experimental and theoretical analyses reinforces the robustness of our findings.

The corrosion inhibition properties of 2-(1,3,4-thiadiazole-2-yl)pyrrolidine (2-TP) on mild steel in a 1 M HCl solution were investigated using weight loss, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and open circuit potential (OCP) measurements. In addition, DFT calculations were performed on 2-TP. The polarization curves revealed that 2-TP is a mixed-type inhibitor. The results indicate that 2-TP is an effective inhibitor for mild steel corrosion in a 1.0 M HCl solution, with an inhibition efficiency of 94.6% at 0.5 mM 2-TP. The study also examined the impact of temperature, revealing that the inhibition efficiency increases with an increasing concentration of 2-TP and decreases with a rise in temperature. The adsorption of the inhibitor on the mild steel surface followed the Langmuir adsorption isotherm, and the free energy value indicated that the adsorption of 2-TP is a spontaneous process that involves both physical and chemical adsorption mechanisms. The DFT calculations showed that the adsorption of 2-TP on the mild steel surface is mainly through the interaction of the lone pair of electrons on the nitrogen atom of the thiadiazole ring with the metal surface. The results obtained from the weight loss, potentiodynamic polarization, EIS and OCP measurements were in good agreement with each other and confirmed the effectiveness of 2-TP as a corrosion inhibitor for mild steel in 1.0 M HCl solution. Overall, the study demonstrates the potential use of 2-TP as a corrosion inhibitor in acid environments.

Synthesis and evaluation of benzo[1,2,3]selenadiazole-isoxazoles as corrosion inhibitors for copper in NaCl: An integrated experimental and theoretical approach

Exploring the effectiveness of two triazole derivatives as copper corrosion inhibitors in NaCl solution: A combined approach of quantitative chemistry and dynamic molecular simulations